In most cases these laws were ignored "because Covid" and went unchallenged.

I'm not sure this is true, but if no one challenges a violation of the law, that is malpractice. The strangest thing is that Republican legislatures, like the one in Pennsylvania, changed the law in order to make things better for Democrats.

So the question is, if someone breaks the law but isn't punished, is that ""legal""?

Ah, a modern take on Bishop Berkeley's old question. I say no in a metaphysical sense. But I also say that if you can stop it but don't, as you claim is what happened, then it's not exactly illegal either.

Here's my view: I don't find most of the claims persuasive. Massive fraud is BS, or at least, I have never seen persuasive evidence. There are a lot of small things that they did, and a lot of large things like they did (like extend mail-in balloting), that are dubious at best. The most smoking gun is the signature rejection rate, which miraculously declined from about 4% to 0.5%, just enough to get the result they wanted.

There's also the question if a clearly unjust law that does not serve the public interest is a valid law? In my state, what happened in 2020 was fully legal, but hardly moral, just, or right.

You're absolutely right about that. But after Corona, all of us should have learned that legality is not necessarily morality, and often the farthest thing from it.